Xcerpt is a declarative, rule-based query and transformation language for XML, inspired by logic programming. Instead of the path-based navigational approach taken by languages like XSLT and XQuery, Xcerpt uses pattern-based, positional queries, where a pattern is an "example" of the database containing variables for binding content. As in logic programming, rules may be chained to form more complex queries.
IkeWiki is a new kind of Wiki (a so-called "Semantic Wiki") developed by Salzburg Research that allows users to collaboratively annotate pages and links between pages with semantic annotations. Such annotations are useful because they give machines a certain amount of "understanding" of the content that goes beyond merely displaying the page. This information can then, for example, be used for context-specific presentation of pages, advanced querying, consistency verification, or drawing conclusions.
The KiWi core system is a flexible platform for building different kinds of semantic social software applications on top (currently the Semantic Wiki and the TagIT application). It provides all the core services required in such applications, like editing and tagging, the storage of content and associated meta-data, its own triple store, transactions and versioning over content and meta-data, a linked open data server, and many small features semantic social software developers will like (like convenience services for working with ontologies or SKOS thesauruses, etc.).
The Linked Media Framework is an easy-to-set-up server application that bundles central Semantic Web technologies to offer advanced services. The Linked Media Framework consists of LMF Core and LMF Modules. The core component of the Linked Media Framework is a Linked Data Server that allows you to expose data following the Linked Data Principles. The Linked Data Server implemented as part of the LMF goes beyond the Linked Data principles by extending them with Linked Data Updates and by integrating management of metadata and content and making both accessible in a uniform way. Its extensions are described in more detail in LinkedMediaPrinciples. In addition to the Linked Data Server, the LMF Core also offers a highly configurable Semantic Search service and a SPARQL endpoint. Setting up and using the Semantic Search component is described in SemanticSearch. Accessing the SPARQL endpoint is described in SPARQLEndpoint. Whereas the extension of the Linked Data principles is already conceptually well-described, work is proceeding on a proper specification and extension of Semantic Search and SPARQL endpoint for Linked Data servers.
As the author of another opensource project (incidentally, its
a direct competitor of SquirrelMail - WebMail/Java), I have to
agree with Luke in all points. In my almost 3 years as project
leader I have made similar experiences.
There are some things that I want to add (just random
- especially small projects tend to be centered around one
person with many people contributing some piece of code at
a certain time. This requires very good planning skills and a
thought-out program design if the project is to be successful.
- with a large enough user base and mailing list, support for
the project can become a "self-runner" (in the viewpoint of
the developer(s)) and it is no longer necessary that the
developers reply to each mail. Expert users can help novice
users. This is a contribution that cannot be valued high
- most people (only few exceptions) accept that there are
periods where other things (e.g. job, ...) are more important
than adding this feature or fixing that bug. They realize that
the project is a volunteer effort and are thankful for it.
- working on a (successful) opensource project gives you
more than learning or satisfaction (as stated in ESRs
papers). It is similar to a curriculum vitae showing your
experiences with certain topics. Actually for me it is possible
to make a living just with the reputation gained from the
project, which is a very great thing.
To conclude, I am very grateful for the chances that have
been offered to me just because of I project I begun out of